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                [Usaco2014 Jan]Recording the Moolympics                 </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium; "><span id="probtext-text" class="mono prewrap">&nbsp;Being a fan of all cold-weather sports (especially those involving cows), Farmer John wants to record as much of the upcoming winter Moolympics as possible.  The television schedule for the Moolympics consists of N different programs (1 &lt;= N &lt;= 150), each with a designated starting time and ending time.  FJ has a dual-tuner recorder that can record two programs simultaneously.  Please help him determine the maximum number of programs he can record in total.  </span></span></p>
<p><span style="font-size: medium; "><span style="font-family: 宋体; ">给出</span><span lang="EN-US">n</span><span style="font-family: 宋体; ">个区间</span><span lang="EN-US">[a,b).</span><span style="font-family: 宋体; ">有</span><span lang="EN-US">2</span><span style="font-family: 宋体; ">个记录器</span><span lang="EN-US">.</span><span style="font-family: 宋体; ">每个记录器中存放的区间不能重叠</span><span lang="EN-US">.</span></span></p>
<p class="MsoNormal"><span style="font-size: medium; "><span style="font-family: 宋体; ">求</span><span lang="EN-US">2</span><span style="font-family: 宋体; ">个记录器中最多可放多少个区间</span><span lang="EN-US">.</span></span></p>
<p class="MsoNormal"><span style="font-size: medium; "><span lang="EN-US">&nbsp;</span></span></p>
<p></p></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium;"><span id="probtext-text" class="mono prewrap">* Line 1: The integer N.</span></span></p>
<p><span style="font-size: medium;"><span id="probtext-text" class="mono prewrap">  * Lines 2..1+N: Each line contains the start and end time of a single         program (integers in the range 0..1,000,000,000). </span></span></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium;"><span id="probtext-text" class="mono prewrap">* Line 1: The maximum number of programs FJ can record.</span></span></p></p><hr/><h3>样例输入</h3><pre>6 
0 3 
6 7 
3 10 
1 5 
2 8 
1 9 

INPUT DETAILS: The Moolympics broadcast consists of 6 programs. The first runs from time 0 to time 3, and so on.</pre><hr/><h3>样例输出</h3><pre>4

 OUTPUT DETAILS: FJ can record at most 4 programs. For example, he can record programs 1 and 3 back-to-back on the first tuner, and programs 2 and 4 on the second tuner.</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Silver 鸣谢Alegria_提供译文</p>
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